Lubricating pump



H. ETZELT LUBRICATING PUMP Aug. 6, 1929.

3 Sheets-Sheet 6 Filed March 1927 V Patented Aug. 6, 1929.,

UNITED STATES PATENT oFF E;

HEINRICH E'JJZEL'JJ, OF DUSSELDORF, GERMANY.

LUBaIoATINe PUMP.

' Application filed March 9, 1927:; Serial No. 174,024.

This invention relates to lubricating pumps and more particularly to thetype, in which the lubricating pump is mounted on the cover of a steamcylinder and is driven by a rodextending through the cylinder cover andalternately raised and lowered by the'reciprocating piston. V v i Thepresent invention has fori'ts object to provide a lubricating pump ofthis kind, in which the stroke of the pump is capable of adjustmentwhilethe latter is in operation.

A further object of the invention is to provi'de such an apparatushaving a plurality of separate pumps, by means of which appara tus aplurality of cylinders can be lubricated simultaneously, for instancethe cylinders of the air pump of railway brakes, in which a highpressure and a low pressure steam cylinder and a high pressure and a lowpressure air cylinder respectively are positionedopposite one anotherand the common piston rods reciprocating between these cylinders must beautomatically lubricated. I p

A further object of the invention is to provide means which also enablesthe stroke of the separate pumps to be adjusted, so that the quantityoflubricant for each separate cylinder can 'be'separately adjusted.

Finally the invention has for its object to provide means, whereby therod ext-endingthrough the cylinder cover can move freel even if thelubricatin device should be screwed askew on the cylinder cover.

In the accompanying drawings a constructional example of the lubricatingpump according to the presentinvention is shown,

Figure 1 being an elevation of thelubrh eating device screwed onto thecover-oi a steam cylinder, certain parts being insection on-line I-I- ofFig. 3,

Figure 2 a vertical section bricating device on line 'IIII'of Fig.3,

Figure 3 a view of the lubricating device from above,

' Figure 4: a detail of the adjusting rneans partly insection on lineIVs-IV of Figs; 1 and 2 and in a casing 10 which is fixed by means ofthe through the lu- Figure 52. side elevation of themeans for.

connecting pieces 11 to the bed plate 12. The bed plate is screwed bymeans of bolts 13 to thecover 14 ofa cylinder, in which a piston 15reciprocates. j"

Into'the casing 10 there extends a shaft 16 which is driven inonedirection by an arrangement to be described below and by a rollerratchet mechanismlfl with a detent device 17'. The shaft 16'isprovidedwith a gland 18.

'On'the projecting part offthe shaft 16 is a casing 20. Thisratchetmechanisn 'casing 20'is providedwith an ordinary crank arm 19made integral with 'it. On the ratchet mechanism casing 20 being rockedto and fro by means of the arm 19, it carries round with it the rollerratchet me'chanism17, which is of a Wellknown construction, andthe-shaft 16 in one direction. On the casing 20 being rocked in theother direction the detent device 17? prevents the shai't16 from turninginthe reverse'dire'ction, so that the shaft 1 6 is turned,

intermittently in one direction by the rocking motion of the arm 19. Apin 21 passing through'the crank arm 19, engages in a groove.

22 between two flanges 24 at the end of a rod 23. One end of reduceddiameter of the rod 23 extends through a casing 25 being secured thereinby a nut 26 on the end projecting from the casing. 'In the casing 25 isa compression spring 27, which presses a washer 28 against the thickerpart of the rod 23. Coaxial with therod23 is a rod'29whichextendsthrough,

the cylinder cover. 14 and is raised each time the piston 15 reachesthe'end of its upward stroke. The rod 29 thenraises the rod. 23.;

compres'singthe spring 27 and rocking the arm 19 upwards. On the piston15 returning, the spring 27 forces thearm 19 and .therod 29 downwardsagain. In this way the shaft 16 is driven by the roller ratchetmechanism 17 in'one direction of rotation. a v For regulating the throwof this motion the casing 25 ismade slidable and adjustable in a'lateral projection 30 of-the casing 10. For I this purpose the casing 25is screwed into a corresponding thread in the projection 30.

The casingf25 can beturned by means of a hexagonal part 32. A sheetmetal member 33 secures the casing against being turnedunintentionally.When thecasing 25is screwed upward in its-thread, the distance, by whichthe crankarm 19 is forced-downwards after each lift, is shortened andthe throw of the crank arm 19 and the amount of rotation of the shaft 16is reduced. The lubricating device can be adjusted in this manner as awhole for delivering a greater or smaller quantity of oil. i

The rod 29 is slidable in a sleeve 35 inserted in an opening in thecylinder cover 14... The surface of the rod 29 is broken by a number ofgrooves 36, for providing a steam-tight closure. On a flange on thesleeve 35 a ring-37 rests, the upper surface of which is spherical andfits into a correspondingly turned part of asleeve' 38 which is screwedinto theplate 12 by means of athread 39. Between the sleeve 38 and theupper part 39 of the sleeve 35 is a clearance 40. The upper end 41 ofthe sleeve 38 is made hexagonal. I

Before the apparatus is bolted on to the 'wylinder cover, the sleeve 35is inserted in a hole in the cylinder cover 14, and, after the apparatushas been bolted down, the ring 37 is laid on the flange. of the sleeve35 and the sleeve 38 is screwed into the plate 12, so that it pressesfirmly on the ring 27 and holds the sleeve 35 securely in the hole inthe cylinder cover. As the rods 29 and 23 can move independently of oneanotherjand as on account of the interposed ring 37 the sleeve 38 canmove independently of the sleeve 35, the rod 29, when sliding in thesleeve 35, is not prevented from moving, even if the lubricatingapparatus should not be bolted truly on to the cylinder cover or ifduring the operation of the device the relative position of thelubricating apparatus and the cylinder cover should slightly alter.

On the side of the casing 10 lying oppositethe casing 25 a number oflubricating pumps is mounted, in the example shownfive pumps. Thesepumps are numbered 45, 46, 47, 48 and 49. As all these pumps necessaryto describe one of th em.

The lower part 50 of the pump, which is preferably made of iron, isfixed to the casing 10 in any suitable manner, for instance by screws51. Into this lower part is screwed a hexagonal metal part 52 to theupper end of which by means of a cap nut 58 a pipe 54,'usually ofcopper, is connected so as to be oiltight. From each of theseparatepuinps the pipe 54 leads to the place to be lubricated by thesaid pump,'which isnot shown in the drawing. When the lubricating deviceis mounted on an air pump for railway brakes, consisting of a highpressure and a low pressure steam cylinder, a high pressure and a lowpressure air pump cylinder and two piston rods connecting the pistons ofthese cylinders together-by pairs, the pump 45 will for instancelubric'ate the high pressure air cylinder, the pump 46 the lowpressure air cylinder. the pump 47 both steam cylinders, the pump 48'the glands betweenthe two high pressure cylinders, and thepump -49 theare alike, it is only glands between the two low pressure cylinders.

In a bore 55 of the part 52 are provided two ball valves 56 and 57,which are pressed 011 their seats by means of light springs. Below thehole into which the hexagonal part 52 is screwed, is a cavity 58 in thepart 50, from which a duct 59 leads downwards. At the lower end thisduct is closed by a screw stopper 60. The lower part of the duct 59 isconnected by a duct 61 to the interior of the casing 10. In a hole 62which intersects the duct 61 at right angles and the end of which isclosed bya screw stopper 63 is a plunger '64, at the end of whichextending into the easing 10 a cylinder 65 is provided, which will inmost cases be made in one piece with the plunger. This cylinder has aportion of its upper side cut away at 66, in which a'ballshaped head 67engages, which is mounted on a shaft 68.' The shaft 68 is at rightangles to the shaft 16 and extends right'throu'gh the casing 10. It ismounted in bearings 69 (Fig. 4) so as to be both rotatable and slidablein its longitudinal direction, At the end of the shaft 16 is a disc 70with a recess 71, in which the ball-shaped head 73 of an arm 72 on theshaft 68 engages. On the shaft 16 being rotated the disc 70 will alsorotate, causing the shaft 68 both to rock about its axis and to he slidlongitudinally.

On thejshaft 68 there are provided as many ball-shaped heads 67 as thereare lubricating pumps. On the shaft 68 rocking to and fro theball-shaped head 67 each time strikes against the left-hand end of therecess 66 in the cylinder 65 and thereby pushes the cylinder 65 with theplunger 64 to the left into the position shown in the drawing. On theball-shapedhead 67 rocking in the other direction, a 'spring75 forcesthe cylinder 65 and the plunger 64 to the right again. i The to-and-fromotion of the shaft 68 in its longifro on their own axes.

In the plunger 64 at the place where it communicates with the duct 59 isa transverse recess 76, from which a duct 77 exteiidsaxially through theplunger to theend of the same. The arrangement is such that the rec'ess76 is always directed downwardsgwhen V a the plunger moves towards theright in Fig.

2 of the drawing. The plunger is thereupon caused to turn, so, thattherecess 76 lies, at the'top, and then moves to the left in Fig. 2.

Thus during the movement of the plunger 64 to the rightlubricat-ing oilis drawn by suction through the duct '77 from the lower end of the duct59 into the rear end of the duct 62. On the plunger returning with itsrecess 76 directed upwardly, the said'lubrieating oil is forced into theupper part of the duct 59 and passes through the ball valves 57 and 56into the pipe 54 and thus to the place the stroke. The length of thestroke ofthe plunger 64 can be separately adjusted for each cylinder,for which purpose the following device is provided:

Opposite each of the'pumps 45 to 49, approximately in the middle of thecasing 10,

i is a vertical shaft 80, the lower end of which is journalled in abearing 81 and the upper end'of which is provided with a head 82journalled in a conical bearing 83. A spring 84 abutting at oneendagainst the cover of the casing 10 and at the other end against a collar85 on the shaft 80 forcesthe head. 82

firmly into the conical bearing 83,- so that a tight joint is formed atthis bearing. On the top end of the shaft 80 a disc 86 is screwed,against which a spring 87 abuts. The spring 87 lies in a recess in thehead 82. The head 82 consists of two parts 82 and 82 (Fig. 1) which arein engagement with one another by means of projections and recesses,;theprojections being forced into therecesses by the spring 87. The part 82has a milled edge,

by means of which the shaft 82 can be turned by hand and adjusted to anyrequired position. For indicating the posit-ion of the shaft 80 a scaleis marked on the bearing 83, on

which a pointer 88 on the part 82 reads; On

the lower end of the shaft 80is a cam disc 90 which lies opposite aprojection 89 on the cylinder and the edge of which is inthe form of aspiral. The spring 7 5' can only force the cylinder 65 as far back asthe position of the spiral-shaped cam disc 90 will allow. If the camdisc be turned, as shown at the right-hand side of Figure 4, so that theprojection 89 rests against its highest point, the stroke of thecylinder 65 and the plunger 64 is reduced to the smallest amount. Ifhowever the cam disc 90 be turned so that its lowest point is oppositethe projection 89, as shown in the middle of Figure 4, the cylinder 65can be pressed back by the spring as far as the ball-shaped head 67 willallow. By setting the cam disc in the intermediate positions the strokeof the plunger 64 can be so adjusted that a greater or smaller quantityof lubricating oil will be delivered.

The interior of the casing 10 is divided by a partition 95, the positionof which is shown in Figure 2 and is indicated in Figure 3 by brokenlines, into two parts 96 and 97. The chamber 96 is closed by a screw-onlid 98 and the chamber 97 by a screw-on lid 99. The chamber 96 containsfor instance a lightbodied lubricating oil for the cylinders of the airpump, while the chamber 97 contains a heavy-bodied oil for lubricatingthe steam cylinders. In the example shown the partition is so positionedthat for instance the pump 47 which delivers the lubricating oil for thesteam cylinders is in communication with the space 97, while the otherlubricating punfip' ffthose,forlubricating the air-pump cylinders andtheir glands, are in communication with the; space 96.

In the wallsof the, casing 10 anumber of glass windows 100 are provided,through which the level ofthe oil in the chambers-can be seen, On the,casing 20 a smalllubricator 101 is provided.

Before the 'air pump or some other machine to belubricated isput'inoperation and itself operates the lubricating device by means of the rod29, the. air; pump or, other machine to be lubricated must be given apreliminary oiling. For this purpose a hand operated crank 103 isprovided on a shaft. 104 whichis journalled in a pillar 105 {screwedinto the cylinder cover 14. A projection 106 onthe end of the shaft104engages in a fork part 107 projecting from the hub of. the arm 19, beingattached to thesame by means of a pin 108. By turning the crank 103 thelubricating device may be operated by-handfor giving the machine apreliminary oiling. WhatIclaimis: v p 1. In a system of thekinddescribed the combination of a. shaft with means for -turn-. ing thesaid shaft, a. second shaft, means. capable of being driven by the firstshaft and of both rocking the second shaft and longitu-Q dinally slidingit to andfro, aplurality of lubricating pumps, a pistonin eachlubricating pump, means provided on the second shaft capable of movingthe pistons in one direction, means forreturni ng the said pistons andca pable of limiting the return movement of'each piston to apre-determined amount, the said latter means comprising a cam disc andmeans rod movable in said casing and operatively connected to thelubricating apparatus so as to'be capable of driving said apparatus,said said first mentioned rod, and a spring in said second rod beingcapable of displacement by casing surrounding saidsecond rod and capableof urging it towards the first mentioned rod, for the purposes setforth.

'3. In a system of the kind described the combination of a machinecomprising a movable part, a lubricating apparatus, a rod between themovable part and the lubricating apparatus and capable of displacementby said movable part, said rod being capable of driving the lubricatingapparatus, means for urging the said rod toward said movable member, asealing sleeve surrounding said rod, said sleeve beingpassed through awall of the machine and a device on the lubricating apparatus forsecuring the sleeve in the wall of the machine, said device surroundingthesleeve with aclearance space between it and 'the said sleeve so as toallow relative movement between the former and'the "latter, as andforthe purposes set forth. g

4. In a system of the kind described the combination of a machinecomprising a movable part, a lubricating apparatus, a rod between saidmovable partand said lubricating apparatus and capable of displacement by said movable part, a sealing sleeve surrounding said rod, said sleevebeing passed through a Wallof the machine, a flange on said sealingsleeve, a ring on said flange having a spherical bearing surface, asleeve on the lubricating apparatus and surrounding said first mentionedsleeve,- Wltll'it clearance between itand said first mentioned sleeve soas to allow relative movementbetween the former and the latter, saidsecond sleeve being capable of bearing against said ring for securingthe first mentioned sleeve on the said wall of the machine, a casingcapable of adjustment with respect to said rod, a second rod movable insaid casing and operatively connected to the lubricating apparatus so asto be capable of driving said apparatus, said second rod being capableof displacement by said first mentioned rod, and a spring in said casingsurrounding said second rod and capable of urging ittowardsthefirstmentioned rod, for the purposes'set forth.

5. In a system of the kind described the combination of a machinecomprising a movable part, a' pump casing, a'driving shaft rockable insaid pump casing, an arm secured on said shaft for rocking the shaft, arod slidable in a wall of said machine and capable of displacement bysaid movable part, a casing mounted on the pump casing and capable ofadjustment thereon with respect to said rod, a second rod movablein saidadjustable casing and operatively connected to said arm,

said second rod being incontact with said first mentioned rod so as tobecapable of displace ment by thelatter and a spring in said adj ustablecasin surrounding said second rod and capable of urging ittoward thefirst mentioned rod, for the purposes set forth.

6. In a system of the kind described the combination of a shaftwithineans for turning the said shaft, a secondshaft capable of beingrocked as Well as of being reciprocated. axially, means on said firstmentioned shaft and operatively connected to said second shaft for bothrocking the second shaft and sliding it axially to and fro, a pluralityof lubrieating pumps, a piston in each lubricating pump, an elongatedaxial recess in each of said pistons, driving means on the secondshafthaving ball heads engaging in said reg cesses for moving the istonsin one direction, means'for returning t lie-said pistons andadjustablestop members,'one for each piston capable of limiting the return axialmovement of each piston to a pre-determined amount, as set forth. p

In testimony whereof I have signed my name to this specification. I

- HEINRICH ETZELT.

